The language of mathematics is universal, transcending cultural and linguistic barriers.

书籍是最安静、最恒久的朋友；它们是最易接近、最睿智的顾问，也是最耐心的老师。

You can't let praise or criticism get to you. It's a weakness to get caught up in either one.

The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.